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Submission #574755

# Submission time Handle Problem Language Result Execution time Memory
574755 2022-06-09T11:40:50 Z OttoTheDino Event Hopping (BOI22_events) C++17
100 / 100
 313 ms 41600 KB 
#include <bits/stdc++.h>
using namespace std;

#define rep(i,s,e)                  for (int i = s; i <= e; ++i)
#define rrep(i,s,e)                 for (int i = s; i >= e; --i)
#define pb                          push_back
#define pf                          push_front
#define fi                          first
#define se                          second
#define all(a)                      a.begin(), a.end()
#define len(a)                      (int)a.size()
typedef long long ll;
typedef pair<int, int> ii;
typedef vector<ii> vii;
typedef vector<int> vi;
typedef vector<double> vd;
typedef vector<string> vs;
typedef vector<ll> vll;

const int mx = 2e5, mx2 = 18;
int p[mx2+1][mx+1], sparse[mx2+1][mx+1], l[mx], r[mx];

int qry (int G, int H) {
    int P = __lg(H-G+1), a = sparse[P][G], b = sparse[P][H-(1<<P)+1];
    if (!a) return b;
    if (!b) return a;
    return (l[a]<l[b]?a:b);
}

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);

    int n, q; cin >> n >> q;

    set<int> st;
    rep (i,1,n) {
        cin >> l[i] >> r[i];
        st.insert(l[i]);
        st.insert(r[i]);
    }

    map<int,int> mp;
    int c = 1;
    for (int el : st) mp[el] = c++;

    rep (i,1,n) l[i] = mp[l[i]], r[i] = mp[r[i]];

    rep (i,1,n)
        if (!sparse[0][r[i]] || l[i] < l[sparse[0][r[i]]])
            sparse[0][r[i]] = i;

    rep (i,1,mx2) {
        rep (j,1,2*n-(1<<i)+1) {
            int x = j, y = j+(1<<(i-1));
            if (!sparse[i-1][x]) sparse[i][j] = sparse[i-1][y];
            else if (!sparse[i-1][y]) sparse[i][j] = sparse[i-1][x];
            else sparse[i][j] = (l[sparse[i-1][x]]<l[sparse[i-1][y]]?sparse[i-1][x]:sparse[i-1][y]);
        }
    }

    rep (i,1,n) p[0][i] = qry (l[i], r[i]);
    rep (i,1,mx2) rep (j,1,n) p[i][j] = p[i-1][p[i-1][j]];

    while (q--) {
        int s, e; cin >> s >> e;
        if (r[s]>r[e]) {
            cout << "impossible\n";
            continue;
        }
        if (s==e) {
            cout << "0\n";
            continue;
        }
        if (l[e]<=r[s]) {
            cout << "1\n";
            continue;
        }

        int cur = e, ans = 0;

        rrep (i,mx2,0) {
            if (l[p[i][cur]]>r[s]) {
                cur = p[i][cur];
                ans += 1<<i;
            }
        }

        if (l[p[0][cur]]<=r[s]) cout << ans+2 << "\n";
        else cout << "impossible\n";
    }

    return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 468 KB Output is correct
2 Correct 158 ms 31260 KB Output is correct
3 Correct 187 ms 31336 KB Output is correct
4 Correct 182 ms 31252 KB Output is correct
5 Correct 198 ms 32280 KB Output is correct
6 Correct 246 ms 33228 KB Output is correct
7 Correct 192 ms 33572 KB Output is correct
8 Correct 279 ms 41580 KB Output is correct
9 Correct 232 ms 41516 KB Output is correct
10 Correct 197 ms 31644 KB Output is correct
11 Correct 222 ms 35600 KB Output is correct
12 Correct 111 ms 31796 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 0 ms 468 KB Output is correct
3 Correct 1 ms 724 KB Output is correct
4 Correct 2 ms 744 KB Output is correct
5 Correct 1 ms 724 KB Output is correct
6 Correct 1 ms 848 KB Output is correct
7 Correct 1 ms 852 KB Output is correct
8 Correct 2 ms 852 KB Output is correct
9 Correct 1 ms 596 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 0 ms 468 KB Output is correct
3 Correct 1 ms 724 KB Output is correct
4 Correct 2 ms 744 KB Output is correct
5 Correct 1 ms 724 KB Output is correct
6 Correct 1 ms 848 KB Output is correct
7 Correct 1 ms 852 KB Output is correct
8 Correct 2 ms 852 KB Output is correct
9 Correct 1 ms 596 KB Output is correct
10 Correct 0 ms 468 KB Output is correct
11 Correct 0 ms 468 KB Output is correct
12 Correct 1 ms 724 KB Output is correct
13 Correct 2 ms 724 KB Output is correct
14 Correct 1 ms 724 KB Output is correct
15 Correct 1 ms 724 KB Output is correct
16 Correct 2 ms 852 KB Output is correct
17 Correct 2 ms 852 KB Output is correct
18 Correct 1 ms 596 KB Output is correct
19 Correct 32 ms 2496 KB Output is correct
20 Correct 31 ms 2252 KB Output is correct
21 Correct 34 ms 2640 KB Output is correct
22 Correct 28 ms 2640 KB Output is correct
23 Correct 26 ms 2936 KB Output is correct
24 Correct 23 ms 2900 KB Output is correct
25 Correct 33 ms 2604 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 0 ms 468 KB Output is correct
3 Correct 1 ms 724 KB Output is correct
4 Correct 2 ms 744 KB Output is correct
5 Correct 1 ms 724 KB Output is correct
6 Correct 1 ms 848 KB Output is correct
7 Correct 1 ms 852 KB Output is correct
8 Correct 2 ms 852 KB Output is correct
9 Correct 1 ms 596 KB Output is correct
10 Correct 0 ms 468 KB Output is correct
11 Correct 1 ms 468 KB Output is correct
12 Correct 1 ms 724 KB Output is correct
13 Correct 1 ms 724 KB Output is correct
14 Correct 1 ms 724 KB Output is correct
15 Correct 1 ms 724 KB Output is correct
16 Correct 1 ms 852 KB Output is correct
17 Correct 1 ms 852 KB Output is correct
18 Correct 1 ms 596 KB Output is correct
19 Correct 140 ms 30656 KB Output is correct
20 Correct 161 ms 30708 KB Output is correct
21 Correct 131 ms 30664 KB Output is correct
22 Correct 185 ms 34392 KB Output is correct
23 Correct 249 ms 40044 KB Output is correct
24 Correct 235 ms 40528 KB Output is correct
25 Correct 29 ms 20952 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 159 ms 31328 KB Output is correct
2 Correct 170 ms 31232 KB Output is correct
3 Correct 188 ms 31228 KB Output is correct
4 Correct 236 ms 41584 KB Output is correct
5 Correct 242 ms 31612 KB Output is correct
6 Correct 257 ms 41196 KB Output is correct
7 Correct 258 ms 41252 KB Output is correct
8 Correct 313 ms 41396 KB Output is correct
9 Correct 226 ms 40084 KB Output is correct
10 Correct 307 ms 40952 KB Output is correct
11 Correct 286 ms 40712 KB Output is correct
12 Correct 299 ms 40908 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 468 KB Output is correct
2 Correct 158 ms 31260 KB Output is correct
3 Correct 187 ms 31336 KB Output is correct
4 Correct 182 ms 31252 KB Output is correct
5 Correct 198 ms 32280 KB Output is correct
6 Correct 246 ms 33228 KB Output is correct
7 Correct 192 ms 33572 KB Output is correct
8 Correct 279 ms 41580 KB Output is correct
9 Correct 232 ms 41516 KB Output is correct
10 Correct 197 ms 31644 KB Output is correct
11 Correct 222 ms 35600 KB Output is correct
12 Correct 111 ms 31796 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 0 ms 468 KB Output is correct
15 Correct 1 ms 724 KB Output is correct
16 Correct 2 ms 744 KB Output is correct
17 Correct 1 ms 724 KB Output is correct
18 Correct 1 ms 848 KB Output is correct
19 Correct 1 ms 852 KB Output is correct
20 Correct 2 ms 852 KB Output is correct
21 Correct 1 ms 596 KB Output is correct
22 Correct 0 ms 468 KB Output is correct
23 Correct 0 ms 468 KB Output is correct
24 Correct 1 ms 724 KB Output is correct
25 Correct 2 ms 724 KB Output is correct
26 Correct 1 ms 724 KB Output is correct
27 Correct 1 ms 724 KB Output is correct
28 Correct 2 ms 852 KB Output is correct
29 Correct 2 ms 852 KB Output is correct
30 Correct 1 ms 596 KB Output is correct
31 Correct 32 ms 2496 KB Output is correct
32 Correct 31 ms 2252 KB Output is correct
33 Correct 34 ms 2640 KB Output is correct
34 Correct 28 ms 2640 KB Output is correct
35 Correct 26 ms 2936 KB Output is correct
36 Correct 23 ms 2900 KB Output is correct
37 Correct 33 ms 2604 KB Output is correct
38 Correct 0 ms 468 KB Output is correct
39 Correct 1 ms 468 KB Output is correct
40 Correct 1 ms 724 KB Output is correct
41 Correct 1 ms 724 KB Output is correct
42 Correct 1 ms 724 KB Output is correct
43 Correct 1 ms 724 KB Output is correct
44 Correct 1 ms 852 KB Output is correct
45 Correct 1 ms 852 KB Output is correct
46 Correct 1 ms 596 KB Output is correct
47 Correct 140 ms 30656 KB Output is correct
48 Correct 161 ms 30708 KB Output is correct
49 Correct 131 ms 30664 KB Output is correct
50 Correct 185 ms 34392 KB Output is correct
51 Correct 249 ms 40044 KB Output is correct
52 Correct 235 ms 40528 KB Output is correct
53 Correct 29 ms 20952 KB Output is correct
54 Correct 159 ms 31328 KB Output is correct
55 Correct 170 ms 31232 KB Output is correct
56 Correct 188 ms 31228 KB Output is correct
57 Correct 236 ms 41584 KB Output is correct
58 Correct 242 ms 31612 KB Output is correct
59 Correct 257 ms 41196 KB Output is correct
60 Correct 258 ms 41252 KB Output is correct
61 Correct 313 ms 41396 KB Output is correct
62 Correct 226 ms 40084 KB Output is correct
63 Correct 307 ms 40952 KB Output is correct
64 Correct 286 ms 40712 KB Output is correct
65 Correct 299 ms 40908 KB Output is correct
66 Correct 0 ms 468 KB Output is correct
67 Correct 165 ms 31308 KB Output is correct
68 Correct 196 ms 31292 KB Output is correct
69 Correct 189 ms 31228 KB Output is correct
70 Correct 185 ms 32460 KB Output is correct
71 Correct 211 ms 33228 KB Output is correct
72 Correct 181 ms 33616 KB Output is correct
73 Correct 263 ms 41600 KB Output is correct
74 Correct 247 ms 41508 KB Output is correct
75 Correct 173 ms 31624 KB Output is correct
76 Correct 217 ms 35580 KB Output is correct
77 Correct 114 ms 31820 KB Output is correct
78 Correct 1 ms 340 KB Output is correct
79 Correct 1 ms 752 KB Output is correct
80 Correct 2 ms 724 KB Output is correct
81 Correct 1 ms 724 KB Output is correct
82 Correct 1 ms 724 KB Output is correct
83 Correct 1 ms 852 KB Output is correct
84 Correct 2 ms 852 KB Output is correct
85 Correct 1 ms 596 KB Output is correct
86 Correct 35 ms 2508 KB Output is correct
87 Correct 33 ms 2260 KB Output is correct
88 Correct 33 ms 2620 KB Output is correct
89 Correct 26 ms 2576 KB Output is correct
90 Correct 24 ms 2984 KB Output is correct
91 Correct 23 ms 2940 KB Output is correct
92 Correct 33 ms 2596 KB Output is correct
93 Correct 138 ms 30700 KB Output is correct
94 Correct 118 ms 30692 KB Output is correct
95 Correct 131 ms 30716 KB Output is correct
96 Correct 206 ms 34260 KB Output is correct
97 Correct 224 ms 40120 KB Output is correct
98 Correct 226 ms 40396 KB Output is correct
99 Correct 34 ms 20828 KB Output is correct
100 Correct 299 ms 41284 KB Output is correct
101 Correct 273 ms 41144 KB Output is correct
102 Correct 274 ms 41368 KB Output is correct
103 Correct 256 ms 40920 KB Output is correct
104 Correct 270 ms 40700 KB Output is correct
105 Correct 292 ms 40884 KB Output is correct
106 Correct 148 ms 29024 KB Output is correct
107 Correct 200 ms 31456 KB Output is correct
108 Correct 216 ms 31516 KB Output is correct
109 Correct 166 ms 31536 KB Output is correct
110 Correct 273 ms 41256 KB Output is correct
111 Correct 250 ms 41128 KB Output is correct